<template name="imageViewerViewport">
    <div class='imageViewerViewport'
        oncontextmenu='return false;'
        unselectable='on'
        onselectstart='return false;'>
    </div>
    <div class='viewportInstructions'>
        Please drag a stack here to view images.
    </div>
    <!--{{> DynamicTemplate template='viewportOverlay' data=tabData}}-->

    {{ >viewportOverlay }}
    {{ >viewportOrientationMarkers }}
</template>